I also scanned it and there is no codes and only backfires when getting off the ramps of freeways and hiways at a stop when i put it in park it goes away even if i feather the gas it seems to disapper. It still happens on side streets but not as often i need to get this fixed this car is in mint shape and is my grandmothers and i dont want it breaking down on her ive got money into this and no luck on getting it fixed